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A nonconducting disk of radius a lies in the z = 0 plane with its center at the origin. The disk is uniformly charged and has a total charge Q. Find Ez on the z axis at the following positions. (Assume that these distances are exact. Use the following as necessary: Q, a, and ?0.) (a) z = 0.3a Ez = (b) z = 0.4a Ez = (c) z = 0.9a Ez = (d) z = a Ez = (e) z = 2a Ez =

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